STABILITY OF A COSMIC-RAY-MAGNETOHYDRODYNAMIC SYSTEM

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27869

Title:	STABILITY OF A COSMIC-RAY-MAGNETOHYDRODYNAMIC SYSTEM
Authors:	Ko,CM;Lo,YY
Contributors:	天文研究所
Keywords:	PARTICLE-MODIFIED SHOCKS;GENERATED ALFVEN WAVES;HYDRODYNAMIC APPROACH;MAGNETIC-FIELD;PARKER INSTABILITY;MOLECULAR CLOUDS;PLASMA INSTABILITY;MEDIATED SHOCKS;ACCELERATION;PROPAGATION
Date:	2009
Issue Date:	2010-06-29 19:35:10 (UTC+8)
Publisher:	中央大學
Abstract:	We study the stability of a four-fluid cosmic-ray-MHD system which comprises magnetized thermal plasma, cosmic rays, forward and backward propagating Alfven waves. The coupling between the plasma, cosmic rays, and waves depends on the energy density of the waves. Local short-wavelength small perturbation analysis is performed on a background steady state. The magnetoacoustic modes of the plasma are modified and intertwined with cosmic ray and wave modes, while the plasma Alfven mode is unaffected. The parameter space is large and the stable/unstable regions of the system are complicated. We discuss some special cases analytically and work out some general cases numerically. Roughly speaking, the system is more likely to be stable if the perturbations have very short wavelength, not propagating at large angle with background magnetic field, large cosmic ray energy density, not too small energy density for both waves and large thermal energy density (and no self-gravity).
Relation:	ASTROPHYSICAL JOURNAL
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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